// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//


#pragma once

#include <pollux/dwio/parquet/reader/parquet_data.h>

namespace kumo::pollux::parquet {
    /// Parquet stores integers of 8, 16, 32 bits with 32 bits and 64 as 64 bits.
    inline int32_t parquetSizeOfIntKind(TypeKind kind) {
        switch (kind) {
            case TypeKind::TINYINT:
            case TypeKind::SMALLINT:
            case TypeKind::INTEGER:
                return 4;
            case TypeKind::BIGINT:
                return 8;
            case TypeKind::HUGEINT:
                return 16;
            default:
                POLLUX_FAIL("Not an integer TypeKind");
        }
    }

    /// Wrapper for static functions for Parquet columns.
    class ParquetColumnReader {
    public:
        /// Builds a reader tree producing 'fileType'. The metadata is in 'params'.
        /// The filters and pruning are in 'scanSpec'.
        static std::unique_ptr<dwio::common::SelectiveColumnReader> build(
            const TypePtr &requestedType,
            const std::shared_ptr<const dwio::common::TypeWithId> &fileType,
            ParquetParams &params,
            common::ScanSpec &scanSpec);
    };
} // namespace kumo::pollux::parquet
